<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 200px;
            height: 100px;
            border: 1px blue solid;
        }
        #div1 {
            margin-bottom: 10px;
            padding: 20px;
        }
        #div6 {
            width: 100px;
            height: 20px;
            border: 1px red solid;
        }
    </style>
</head>
<body>
    <div id="div1">
        <div id="div6">这是div1</div>
    </div>
    <div id="div2">这是div2</div>
    <div id="div3">这是div3</div>
    <div id="div4">这是div4</div>
    <div id="div5">这是div5</div>
</body>
</html>